This document analyzes the initial base year (2016) model output for the TRMG2 against the TRMv6.2. Note: The TRMG2 2016 base year will be updated to the 2020 upon final delivery, however the interim delivery of the 2016 network is useful to analyze the TRMG2 assignment in comparison to the TRMv6.2. Note, as the TRMG2 model includes the expansion into Alamance and Johnston Counties, county level totals may deviate from totals in TRMv6.2.
Overall, takeaways include:
- Assignment on MPO and County levels are much closer to count totals, an improvement on TRMv6.2
- Even with introduction of Alamance and Johnston county expansions, traffic assignment better matched TRMv6.2
- Transit assignment was particularly improved, especially for GoTriangle, NCSU and Duke routes
- Two screenlines and one cutline representing I-85, I-40 and the Downtown Durham Loop were manually added into the network to evaluate performance; each were within the targer range.
- VMT is 5% higher in TRMG2, mainly originating from Wake County, which may cause concern
Base Year (2016) Comparison
Volume - Total Daily Flow
MPO
TRMv6.2 Total Volume by MPO
|
MPO_Tag
|
Total_Volume
|
Total_Counts
|
Count
|
PctDiff
|
|
CAMPO
|
31804488
|
33161360
|
2322
|
-0.0426629
|
|
DCHC
|
15768182
|
16117220
|
1140
|
-0.0221356
|
|
None
|
4956044
|
4885010
|
918
|
0.0143327
|
|
Total
|
52528714
|
54163590
|
4380
|
-0.0311235
|
TRMG2 Total Volume by MPO
|
MPO_Tag
|
Total_Volume
|
Total_Counts
|
Count
|
PctDiff
|
|
CAMPO
|
33974991
|
33307230
|
2367
|
0.0196545
|
|
DCHC
|
16686192
|
16299307
|
1166
|
0.0231860
|
|
None
|
5455538
|
5949920
|
1047
|
-0.0906203
|
|
Total
|
56116721
|
55556457
|
4580
|
0.0099839
|
County
Note totals may not equal from MPO to County due to links missing either MPO or County label in TRMG2 or TRMv6.2
TRMv6.2 Total Volume by County
|
COUNTY
|
Total_Volume
|
Total_Counts
|
Count
|
PctDiff
|
|
alamance
|
0.0
|
0
|
0
|
NaN
|
|
chatham
|
845870.5
|
800100
|
142
|
0.0541105
|
|
durham
|
12016012.0
|
12616470
|
809
|
-0.0499715
|
|
franklin
|
979763.4
|
1091880
|
225
|
-0.1144323
|
|
granville
|
674119.0
|
673990
|
138
|
0.0001914
|
|
harnett
|
728257.7
|
593780
|
144
|
0.1846567
|
|
johnston
|
3509072.8
|
3440690
|
440
|
0.0194874
|
|
nash
|
124308.5
|
110000
|
29
|
0.1151050
|
|
orange
|
4007723.6
|
3709140
|
421
|
0.0745020
|
|
person
|
644518.2
|
820930
|
186
|
-0.2737112
|
|
wake
|
28884130.1
|
30195530
|
1808
|
-0.0454021
|
|
Total
|
52413775.8
|
54052510
|
4342
|
-0.0312653
|
TRMG2 Total Volume by County
|
County
|
Total_Volume
|
Total_Counts
|
Count
|
PctDiff
|
|
alamance
|
875218.15
|
918000
|
61
|
-0.0488814
|
|
chatham
|
912262.99
|
830880
|
145
|
0.0892100
|
|
durham
|
12969703.99
|
12761537
|
828
|
0.0160503
|
|
franklin
|
1020690.38
|
1052190
|
221
|
-0.0308611
|
|
granville
|
628106.70
|
702670
|
134
|
-0.1187112
|
|
harnett
|
652223.98
|
585480
|
140
|
0.1023329
|
|
johnston
|
3436414.09
|
3686610
|
505
|
-0.0728073
|
|
nash
|
66200.31
|
58670
|
30
|
0.1137504
|
|
orange
|
3925944.75
|
3705250
|
447
|
0.0562144
|
|
person
|
527404.48
|
825020
|
191
|
-0.5643022
|
|
wake
|
31020631.33
|
30336900
|
1846
|
0.0220412
|
|
Total
|
56034801.14
|
55463207
|
4548
|
0.0102007
|
FC_Group
TRMv6.2 Total Volume by Facility
|
FCGROUP_Tag
|
Total_Volume
|
Total_Counts
|
Count
|
PctDiff
|
|
Local
|
4735796
|
4655830
|
1130
|
0.0168854
|
|
Collector
|
6441994
|
6623550
|
1084
|
-0.0281832
|
|
Minor Arterial
|
13151478
|
13397660
|
1015
|
-0.0187189
|
|
Major Arterial
|
13835061
|
15284820
|
763
|
-0.1047888
|
|
Freeway
|
14257957
|
14084500
|
349
|
0.0121656
|
|
Total
|
52422286
|
54046360
|
4341
|
-0.0309806
|
TRMG2 Total Volume by Facility
|
HCMType
|
Total_Volume
|
Total_Counts
|
Count
|
PctDiff
|
|
TLHighway
|
814139.5
|
716100
|
79
|
0.1204210
|
|
Local
|
1217696.3
|
1164780
|
453
|
0.0434561
|
|
MajorCollector
|
1300728.7
|
1364260
|
274
|
-0.0488428
|
|
MLHighway
|
2394673.5
|
2297000
|
115
|
0.0407878
|
|
Collector
|
2644544.0
|
2879440
|
820
|
-0.0888229
|
|
Arterial
|
13139758.1
|
13604123
|
1601
|
-0.0353404
|
|
Freeway
|
14787505.0
|
14060257
|
359
|
0.0491799
|
|
MajorArterial
|
19678396.5
|
19331197
|
876
|
0.0176437
|
|
Total
|
55977441.5
|
55417157
|
4577
|
0.0100091
|
Cutline/Screenlines
Added one cutline (Downtown Durham Loop) and two screenlines (I-85 and I-40) for further evaluation of the TRMG2 assignment.
TRMG2 Screenlines:

TRMv6.2 Total Volume by Screenline
|
SL_Tag
|
Total_Volume
|
Total_Counts
|
Count
|
PctDiff
|
|
I-40
|
1366435.5
|
1364840
|
76
|
0.0011676
|
|
I-85
|
373408.4
|
397900
|
37
|
-0.0655894
|
|
Wake/Durham County Line
|
623487.9
|
660500
|
34
|
-0.0593629
|
TRMv6.2 Total Volume by Cutline
|
Cut_Line
|
Cutline
|
Total_Volume
|
Total_Counts
|
Count
|
PctDiff
|
|
Southwest Durham
|
1
|
218687.56
|
208500
|
9
|
0.0465850
|
|
Downtown Durham Loop
|
2
|
502879.52
|
548200
|
40
|
-0.0901219
|
|
Johnston County
|
4
|
315294.98
|
290390
|
31
|
0.0789895
|
|
Chatham County
|
5
|
42745.66
|
40600
|
5
|
0.0501960
|
|
North Raleigh
|
7
|
723814.37
|
744890
|
38
|
-0.0291175
|
|
Eastern Wake
|
8
|
466298.95
|
514800
|
37
|
-0.1040128
|
|
US-1 South
|
9
|
253017.13
|
257800
|
15
|
-0.0189033
|
|
North Wake
|
11
|
265991.52
|
249600
|
21
|
0.0616242
|
|
Along US 70
|
12
|
190236.92
|
227800
|
8
|
-0.1974542
|
|
Along I440E and W of I-40
|
13
|
388798.87
|
409900
|
13
|
-0.0542726
|
|
Chatham/Wake Line
|
14
|
63151.99
|
60370
|
9
|
0.0440524
|
|
Wake/Harnett Line
|
15
|
68517.06
|
54400
|
12
|
0.2060371
|
|
US 64 East
|
16
|
43101.54
|
36400
|
9
|
0.1554827
|
|
Durham/Orange Line
|
17
|
356132.96
|
328880
|
23
|
0.0765247
|
TRMG2 Total Volume by Screenline and Cutline
|
Screen_Line
|
ScreenlineNum
|
Total_Volume
|
Total_Counts
|
Count
|
PctDiff
|
Type
|
|
Wake/Harnett Line
|
1
|
87572.97
|
74580
|
22
|
0.1483673
|
Screen
|
|
Wake/Johnston Line
|
2
|
292293.58
|
244950
|
32
|
0.1619727
|
Screen
|
|
Wake/Franklin
|
3
|
114286.73
|
106250
|
21
|
0.0703208
|
Cut
|
|
Wake/Durham
|
4
|
389170.25
|
393300
|
29
|
-0.0106117
|
Cut
|
|
Southern Durham/Chatham
|
5
|
61967.55
|
50400
|
6
|
0.1866711
|
Cut
|
|
Durham/Orange
|
6
|
375870.26
|
327600
|
25
|
0.1284227
|
Screen
|
|
Durham + Orange/Person
|
7
|
21941.43
|
23770
|
7
|
-0.0833389
|
Cut
|
|
Durham/Granville
|
8
|
63843.34
|
55500
|
4
|
0.1306846
|
Cut
|
|
Downtown Durham Loop
|
9
|
519814.68
|
518300
|
39
|
0.0029139
|
Cut
|
|
I-40
|
10
|
1430275.89
|
1374840
|
76
|
0.0387589
|
Cut
|
|
I-85
|
11
|
337677.77
|
367600
|
35
|
-0.0886118
|
Cut
|
VMT
MPO
TRMv6.2 Total VMT by MPO
|
MPO_Tag
|
Total_VMT
|
|
CAMPO
|
34546729
|
|
DCHC
|
14516717
|
|
None
|
7864112
|
|
Total
|
56927559
|
TRMG2 Total VMT by MPO
|
MPO_Tag
|
Total_VMT
|
|
CAMPO
|
36385516
|
|
DCHC
|
14649340
|
|
None
|
8731138
|
|
Total
|
59765995
|
County
TRMv6.2 Total Volume by County
|
COUNTY
|
Total_VMT
|
|
alamance
|
0.0
|
|
chatham
|
1887084.2
|
|
durham
|
9579639.4
|
|
franklin
|
1482186.2
|
|
granville
|
1311675.1
|
|
harnett
|
1099687.9
|
|
johnston
|
6071384.1
|
|
nash
|
250834.7
|
|
orange
|
5220110.2
|
|
person
|
726642.3
|
|
wake
|
29143576.4
|
|
Total
|
56772820.5
|
TRMG2 Total Volume by County
|
County
|
Total_VMT
|
|
alamance
|
993303.3
|
|
chatham
|
1908876.6
|
|
durham
|
9896837.6
|
|
franklin
|
1562436.3
|
|
granville
|
1176954.3
|
|
harnett
|
1001411.4
|
|
johnston
|
5819437.0
|
|
nash
|
199840.0
|
|
orange
|
5146945.8
|
|
person
|
592546.6
|
|
wake
|
31202620.1
|
|
Total
|
59501209.1
|
FC_Group
TRMv6.2 Total Volume by Facility
|
FCGROUP_Tag
|
Total_VMT
|
|
Local
|
5886949
|
|
Collector
|
6356286
|
|
Minor Arterial
|
8656589
|
|
Major Arterial
|
11077322
|
|
Freeway
|
20640977
|
|
Total
|
52618123
|
TRMG2 Total Volume by Facility
|
HCMType
|
Total_VMT
|
|
TLHighway
|
1391382
|
|
MajorCollector
|
1419038
|
|
Local
|
1535881
|
|
Collector
|
3105077
|
|
MLHighway
|
3187588
|
|
Arterial
|
10850355
|
|
MajorArterial
|
10872446
|
|
Freeway
|
23010932
|
|
Total
|
55372698
|
Volume Group
TBD - working on this
Transit
Please excuse the lower case, it helps join the observed to the V6 outputs.
TRMv6.2 Total Transit Ridership by TOD
|
OPERATOR
|
Total_OP
|
Total_PK
|
Total_Trips
|
Observed
|
PctDev
|
|
cat
|
9899.0531
|
13954.4857
|
23853.5388
|
24114
|
-0.0108012
|
|
cht
|
13394.6948
|
16401.7934
|
29796.4883
|
26356
|
0.1305391
|
|
ctran
|
1189.5224
|
1407.4559
|
2596.9783
|
1001
|
1.5943839
|
|
data
|
11359.4352
|
11927.1762
|
23286.6113
|
21472
|
0.0845106
|
|
duke
|
3715.8149
|
4301.9723
|
8017.7872
|
14321
|
-0.4401378
|
|
ncsu
|
7252.3925
|
4621.1928
|
11873.5852
|
16530
|
-0.2816948
|
|
opt
|
325.1405
|
251.0703
|
576.2108
|
0
|
Inf
|
|
tta
|
2793.9636
|
14240.5786
|
17034.5422
|
8997
|
0.8933580
|
|
Total
|
49930.0170
|
67105.7252
|
117035.7421
|
112791
|
0.0376337
|
TRMG2 Total Transit Ridership by TOD
|
Agency
|
AM
|
MD
|
PM
|
NT
|
Total
|
|
Chapel Hill Transit
|
6316.585946
|
5778.59395
|
8539.814055
|
5899.50712
|
26534.501080
|
|
Chatham Transit
|
2.209048
|
0.00000
|
1.573097
|
0.00000
|
3.782145
|
|
Duke
|
2878.575769
|
2577.41527
|
3505.813238
|
2674.82429
|
11636.628570
|
|
GoCary
|
394.533364
|
652.47471
|
631.363632
|
627.44636
|
2305.818063
|
|
GoDurham
|
3353.605610
|
7191.61067
|
5607.917597
|
6150.10307
|
22303.236948
|
|
GoRaleigh
|
4432.955456
|
7506.93100
|
7744.810579
|
6272.74533
|
25957.442371
|
|
GoRaleigh/GoTriangle
|
137.381167
|
0.00000
|
247.138422
|
0.00000
|
384.519589
|
|
GoTriangle
|
4589.713367
|
2654.05478
|
7258.499514
|
2264.16985
|
16766.437513
|
|
NCSU Wolfline
|
3410.702171
|
3456.39717
|
3808.595557
|
3841.87703
|
14517.571935
|
|
Orange County Public Transit
|
24.042385
|
30.09061
|
8.247979
|
33.30049
|
95.681463
|
Sensitivity Tests
Nonmotorized Test
Overview
The nonmotorized test removed the entire American Tobacco Trail from the network. Inputs from the 2016 base year were kept exactly the same. Total TAZ level nonmotorized trips are compared to the base year with American Tobacco Trail included to this test scenario below. Outputs analyzed include nonmotorized trips and VMT to determine TRMG2 sensitivity to scenario testing.
## Reading layer `full taz' from data source
## `C:\Users\JacobFo\OneDrive - City of Durham\Archive\full taz.shp'
## using driver `ESRI Shapefile'
## Simple feature collection with 2857 features and 14 fields
## Geometry type: MULTIPOLYGON
## Dimension: XY
## Bounding box: xmin: -79.40362 ymin: 35.32399 xmax: -78.12731 ymax: 36.49584
## Geodetic CRS: Unknown datum based upon the GRS 1980 ellipsoid
## Reading layer `hwy_links' from data source
## `C:\Users\JacobFo\TRMG2_v0.2\scenarios\base_2016\output\networks\hwy_links.shp'
## using driver `ESRI Shapefile'
## Simple feature collection with 127834 features and 60 fields
## Geometry type: LINESTRING
## Dimension: XY
## Bounding box: xmin: -79.407 ymin: 35.33281 xmax: -78.08683 ymax: 36.49905
## Geodetic CRS: NAD83
Nonmotorized Trips
Difference in NM Trips
|
County
|
Test NM Trips
|
Base NM Trips
|
Difference
|
|
Alamance
|
5,084
|
5,103
|
-19
|
|
Chatham
|
9,692
|
9,687
|
4
|
|
Durham
|
59,464
|
59,431
|
33
|
|
Franklin
|
11,210
|
11,219
|
-8
|
|
Granville
|
6,473
|
6,480
|
-6
|
|
Harnett
|
7,284
|
7,280
|
4
|
|
Johnston
|
35,014
|
35,015
|
-1
|
|
Nash
|
832
|
829
|
3
|
|
Orange
|
27,168
|
27,205
|
-37
|
|
Person
|
6,621
|
6,630
|
-9
|
|
Total
|
375,141
|
375,035
|
106
|
|
Wake
|
206,298
|
206,156
|
142
|
Difference in NM Trips
|
ClusterName
|
Test NM Trips
|
Base NM Trips
|
Difference
|
|
Cary
|
51,033
|
50,966
|
67
|
|
Chapel Hill
|
16,444
|
16,463
|
-19
|
|
Durham
|
28,576
|
28,578
|
-2
|
|
Garner
|
20,223
|
20,235
|
-12
|
|
Northeast
|
53,775
|
53,809
|
-34
|
|
Northwest
|
24,850
|
24,896
|
-46
|
|
Raleigh
|
64,851
|
64,792
|
59
|
|
RTP
|
1,710
|
1,722
|
-12
|
|
South
|
21,986
|
21,934
|
53
|
|
Southeast
|
48,117
|
48,121
|
-4
|
|
Southern Durham
|
36,133
|
36,081
|
52
|
|
Southwest
|
7,443
|
7,440
|
3
|
|
Total
|
375,141
|
375,035
|
106
|
VMT
Difference in VMT
|
MPO_Tag
|
Test VMT
|
Base VMT
|
Difference
|
|
CAMPO
|
36,378,762
|
36,385,516
|
-6,755
|
|
DCHC
|
14,651,595
|
14,649,340
|
2,255
|
|
None
|
8,729,036
|
8,731,138
|
-2,102
|
|
Total
|
59,759,393
|
59,765,995
|
-6,602
|
Difference in VMT
|
County
|
Test VMT
|
Base VMT
|
Difference
|
|
alamance
|
993,211
|
993,303
|
-92
|
|
chatham
|
1,908,338
|
1,908,877
|
-539
|
|
durham
|
9,899,289
|
9,896,838
|
2,452
|
|
franklin
|
1,559,040
|
1,562,436
|
-3,396
|
|
granville
|
1,176,813
|
1,176,954
|
-142
|
|
harnett
|
1,001,558
|
1,001,411
|
147
|
|
johnston
|
5,815,859
|
5,819,437
|
-3,578
|
|
nash
|
199,951
|
199,840
|
111
|
|
orange
|
5,146,474
|
5,146,946
|
-472
|
|
person
|
592,024
|
592,547
|
-522
|
|
wake
|
31,202,005
|
31,202,620
|
-615
|
|
Total
|
59,494,563
|
59,501,209
|
-6,646
|
Transit Test
Overview
Transit Ridership
TRMG2 Total Transit Ridership by TOD
|
Agency
|
AM
|
MD
|
PM
|
NT
|
Total
|
|
Chapel Hill Transit
|
6317
|
5779
|
8540
|
5900
|
26535
|
|
Chatham Transit
|
2
|
0
|
2
|
0
|
4
|
|
Duke
|
2879
|
2577
|
3506
|
2675
|
11637
|
|
GoCary
|
395
|
652
|
631
|
627
|
2306
|
|
GoDurham
|
3354
|
7192
|
5608
|
6150
|
22303
|
|
GoRaleigh
|
4433
|
7507
|
7745
|
6273
|
25957
|
|
GoRaleigh/GoTriangle
|
137
|
0
|
247
|
0
|
385
|
|
GoTriangle
|
4590
|
2654
|
7258
|
2264
|
16766
|
|
NCSU Wolfline
|
3411
|
3456
|
3809
|
3842
|
14518
|
|
Orange County Public Transit
|
24
|
30
|
8
|
33
|
96
|
|
Total
|
25540
|
29848
|
37354
|
27764
|
120506
|
Transit Test Scenario Total Transit Ridership by TOD
|
Agency
|
AM
|
MD
|
PM
|
NT
|
Total
|
|
Chapel Hill Transit
|
6272
|
7085
|
9121
|
7063
|
29540
|
|
Chatham Transit
|
9
|
0
|
4
|
0
|
13
|
|
Duke
|
2961
|
2492
|
3395
|
2579
|
11429
|
|
GoCary
|
640
|
1319
|
1062
|
1128
|
4149
|
|
GoDurham
|
4652
|
10400
|
7387
|
8608
|
31048
|
|
GoRaleigh
|
6946
|
11709
|
11691
|
9380
|
39726
|
|
GoRaleigh/GoTriangle
|
223
|
0
|
366
|
0
|
589
|
|
GoTriangle
|
7224
|
3973
|
10223
|
3243
|
24663
|
|
NCSU Wolfline
|
3360
|
3356
|
3730
|
3747
|
14193
|
|
Orange County Public Transit
|
35
|
77
|
19
|
77
|
208
|
|
Total
|
32324
|
40412
|
46998
|
35824
|
155558
|
Difference Transit Test - TRMG2
|
Agency
|
AM
|
MD
|
PM
|
NT
|
Total
|
|
Chapel Hill Transit
|
-44
|
1,306
|
581
|
1,163
|
3,006
|
|
Chatham Transit
|
7
|
0
|
2
|
0
|
9
|
|
Duke
|
83
|
-85
|
-110
|
-95
|
-208
|
|
GoCary
|
246
|
666
|
431
|
501
|
1,844
|
|
GoDurham
|
1,299
|
3,209
|
1,779
|
2,458
|
8,745
|
|
GoRaleigh
|
2,513
|
4,202
|
3,946
|
3,107
|
13,768
|
|
GoRaleigh/GoTriangle
|
85
|
0
|
119
|
0
|
204
|
|
GoTriangle
|
2,634
|
1,319
|
2,964
|
979
|
7,896
|
|
NCSU Wolfline
|
-50
|
-100
|
-79
|
-95
|
-325
|
|
Orange County Public Transit
|
11
|
47
|
11
|
44
|
112
|
|
Total
|
6,784
|
10,564
|
9,644
|
8,060
|
35,052
|
VMT
Difference in VMT
|
MPO_Tag
|
Test VMT
|
Base VMT
|
Difference
|
|
CAMPO
|
36,236,800
|
36,385,516
|
-148,716
|
|
DCHC
|
14,579,174
|
14,649,340
|
-70,166
|
|
None
|
8,724,707
|
8,731,138
|
-6,431
|
|
Total
|
59,540,681
|
59,765,995
|
-225,314
|
Difference in VMT
|
County
|
Test VMT
|
Base VMT
|
Difference
|
|
alamance
|
992,850
|
993,303
|
-453
|
|
chatham
|
1,903,261
|
1,908,877
|
-5,616
|
|
durham
|
9,844,999
|
9,896,838
|
-51,838
|
|
franklin
|
1,560,203
|
1,562,436
|
-2,234
|
|
granville
|
1,175,185
|
1,176,954
|
-1,770
|
|
harnett
|
1,001,145
|
1,001,411
|
-266
|
|
johnston
|
5,816,968
|
5,819,437
|
-2,469
|
|
nash
|
199,824
|
199,840
|
-16
|
|
orange
|
5,130,367
|
5,146,946
|
-16,578
|
|
person
|
592,233
|
592,547
|
-313
|
|
wake
|
31,059,203
|
31,202,620
|
-143,417
|
|
Total
|
59,276,238
|
59,501,209
|
-224,971
|